问题
So difficult______ it to acquire a large vocabulary without the help of a teacher that he was close to giving up .
A:he have felt
B:have he felt
C:he did feel
D:did he feel
B:have he felt
C:he did feel
D:did he feel
正确答案是：
同类题型
He’s particular about food, I dare not serve him the dish, __________ his scolding
_______ ways to get on well with your classmates, or you will get yourself very lonely.
1___ old man is ____ teacher. He likes playing ____basketball after supper.
raid Mr. Wood can’t see you until 4 o’clock;–Oh, ______ I won’t wait.